office 365 add/remove secondary smtp account to user

Disclaimer: code was a copy paste from some other website so don't use it without think through what it is going to do.

The idea is the 2 field you need to change is mail attribute (if you want to change the primary domain) and proxyaddresses attribute (for multiple email address for a user)

I usually change this in attribute editor from ACtive Directory User Computer but you can do it via powershell below


you can use either via powershell stle ldap

               $aduser = get-aduser -identity xxxxxxx
                #    append value to proxyaddress array using ADSI Edit connector
                $user = [ADSI]"LDAP://$($aduser.distinguishedname)"
                $ads_property_append = 3
                $user.Putex($ads_property_append, "proxyaddresses",  @("smtp:$($aduser.emailaddress)"))
                $user.setinfo()

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or via powershell

$user = Get-ADUser GlenJohn -Properties mail,department,ProxyAddresses
$user.ProxyAddresses = "glen@fabrikam.com"   ## or maybe use += to have multiple of proxyaddresses
Set-ADUser -instance $user 

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Also remember (i know you will), since you add additional domain, you need to verify that domain on office 365 and change the MX record accordingly for the full solution to work

in active directory in which position you update the information for the user???